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      <title>如何优化 Maven 构建速度？本地仓库、并行构建与增量编译技巧 - 交互式测验</title>
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        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
        }

        .nav-btn {
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          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
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          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
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        #next-btn {
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        .nav-btn:hover {
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        .result-box {
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        .source-text {
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        .final-score-container h2 {
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      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>如何优化 Maven 构建速度？本地仓库、并行构建与增量编译技巧 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "根据文档，为什么推荐企业内部搭建 Nexus 私服来优化 Maven 构建？",
    "options": [
      "Nexus 私服可以自动将项目打包成 Docker 镜像。",
      "Nexus 私服是唯一支持发布 SNAPSHOT 版本依赖的仓库。",
      "Nexus 私服可以作为中央仓库的缓存，让 Maven 优先从局域网下载依赖，从而减少网络延迟。",
      "Nexus 私服强制要求所有开发者使用相同的 Maven 版本，以保证构建一致性。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档明确指出，搭建 Nexus 私服的主要目的是作为依赖的缓存。当开发者或 CI/CD 服务器需要下载依赖时，会优先从本地网络中的 Nexus 私服获取，这比每次都从遥远的中央仓库下载要快得多，极大地减少了网络延迟对构建速度的影响。",
    "source": "文档中「1.2 使用 Nexus 私服加速依赖下载」部分",
    "hint": "思考一下，当多个团队成员都需要同一个依赖时，如何避免每个人都去远程下载一遍？"
  },
  {
    "question": "在执行 Maven 命令时，参数 `-T 1C` 的作用是什么？",
    "options": [
      "它会强制 Maven 以单线程模式运行，以兼容旧的插件。",
      "它指示 Maven 使用一个固定的线程（1 Core）来执行构建。",
      "它会为每个 CPU 核心启动一个线程，从而在多模块项目中实现并行构建。",
      "它会清理（Clean）目标目录一次（1 Clean）。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档中提到，`-T` 参数用于启用 Maven 的多线程构建功能。后缀 `1C` 是一个动态计算方式，代表 '1倍于CPU核心数'。例如，如果你的电脑是 8 核 CPU，使用 `-T 1C` 将会启动 8 个线程来并行构建项目中的模块，这能显著提升多模块项目的构建速度。",
    "source": "文档中「2.1 启用多线程构建」部分",
    "hint": "文档提到“现代 CPU 一般都有多个核心”，这个参数正是为了充分利用这一特性。"
  },
  {
    "question": "为了避免对未修改的 Java 文件进行不必要的重复编译，应该如何在 `maven-compiler-plugin` 中配置？",
    "options": [
      "在 `<configuration>` 中添加 `<parallel>true</parallel>`。",
      "在 `<configuration>` 中将 `<updatePolicy>` 设置为 `never`。",
      "在 `<configuration>` 中将 `<useIncrementalCompilation>` 设置为 `true`。",
      "在 `<configuration>` 中添加 `<goal>compile-only</goal>`。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "增量编译是提升后续构建速度的关键。通过在 `maven-compiler-plugin` 的配置中将 `<useIncrementalCompilation>` 设为 `true`，Maven 在编译时会先检查源文件的修改时间戳，只重新编译那些自上次构建以来发生变化的文件及其依赖项，从而避免了全量编译的耗时。",
    "source": "文档中「3.2 配置 maven-compiler-plugin」部分",
    "hint": "这个配置项的字面意思就是“使用增量编译”。"
  },
  {
    "question": "文档中提到，SNAPSHOT 依赖默认会频繁检查更新，影响构建速度。推荐的优化方法是修改 `settings.xml` 中的什么配置？",
    "options": [
      "在 `<mirrorOf>` 标签中排除所有 SNAPSHOT 仓库。",
      "为 SNAPSHOT 仓库配置 `<updatePolicy>` 为 `daily`。",
      "将所有 SNAPSHOT 依赖的版本号改为固定的 release 版本。",
      "在 `<profile>` 中禁用所有包含 SNAPSHOT 的仓库。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档指出，Maven 默认每次构建都会检查 SNAPSHOT 依赖是否有新版本，这会增加网络请求和构建时间。通过在仓库配置中将 snapshots 的 `<updatePolicy>` 设置为 `daily`，可以限制 Maven 每天只检查一次更新，从而在保证能获取到较新版本的同时，显著提高日常构建的效率。",
    "source": "文档中「1.3 避免 SNAPSHOT 版本频繁更新」部分",
    "hint": "如何让 Maven 不那么“勤快”地检查快照版本的更新？"
  },
  {
    "question": "执行 `mvn dependency:go-offline` 命令的主要目的是什么？",
    "options": [
      "分析并找出项目中声明了但未被使用的依赖。",
      "将项目打包，并包含所有依赖项，使其可以离线运行。",
      "强制 Maven 清理本地仓库中所有缓存的依赖。",
      "预先下载项目所需的所有依赖到本地仓库，以支持后续的离线构建并避免构建时下载。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "`dependency:go-offline` 这个 goal 的设计初衷就是为了让构建过程“离线化”。它会解析项目的 `pom.xml`，并将所有在远程仓库的依赖项（包括插件依赖）提前下载到本地仓库。这样，在后续执行 `mvn install` 或 `mvn package` 等命令时，Maven 就不再需要访问网络，从而消除了网络波动带来的不确定性，并加快了构建速度。",
    "source": "文档中「4.1 启用 maven-dependency-plugin」部分",
    "hint": "命令中的“go-offline”是什么意思？"
  },
  {
    "question": "在项目根目录下创建 `.mvn/jvm.config` 文件有什么作用？",
    "options": [
      "用于定义项目特定的 Maven 插件版本。",
      "用于存储私有仓库的用户名和密码。",
      "用于为 Maven 构建过程本身配置 JVM 参数，如内存大小和编译模式。",
      "用于声明项目中所有模块的构建顺序。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "`.mvn/jvm.config` 文件是 Maven 3.3.1 版本引入的一个特性，它允许你为项目指定专属的 JVM 运行参数。文档中的示例 `-Xmx2g` 就是在告诉 JVM，为本次 Maven 构建分配最大 2GB 的堆内存。通过这种方式优化 JVM，可以减少垃圾回收的频率和 Maven 进程的启动时间，从而提高构建效率。",
    "source": "文档中「4.2 配置 .mvn/jvm.config」部分",
    "hint": "这个配置文件的名称直接暗示了它的作用与哪个虚拟机有关。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
        // 存储每个问题的回答状态
        const userAnswers = new Array(quizData.length).fill(null); 

        const questionTextEl = document.getElementById('question-text');
        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

        function loadQuestion() {
          resultContainerEl.innerHTML = '';
          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
          if (currentQuestionIndex >= quizData.length) {
            showFinalScore();
            return;
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          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
          currentQuestion.options.forEach((optionText, index) => {
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            li.className = 'option-item';
            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
                if (index === userAnswers[currentQuestionIndex]) {
                    li.classList.add('selected');
                }
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            optionsListEl.appendChild(li);
          });

          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
              const isCorrect = userAnswers[currentQuestionIndex] === currentQuestion.correctAnswerIndex;
              showResult(isCorrect, currentQuestion);
          }
          
          updateNavigationButtons();
          updateProgress();
        }

        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

            showResult(isCorrect, currentQuestion);
            updateNavigationButtons();
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        function updateProgress() {
            const answeredQuestions = userAnswers.filter(answer => answer !== null).length;
            const progressPercentage = (answeredQuestions / quizData.length) * 100;
            progressIndicatorEl.style.width = `${progressPercentage}%`;
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        function updateNavigationButtons() {
            prevBtn.style.display = 'block';
            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
            Array.from(optionsListEl.children).forEach((child, index) => {
                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
            });
        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
        }

        function goToPreviousQuestion() {
            if (currentQuestionIndex > 0) {
                currentQuestionIndex--;
                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
            if (currentQuestion.hint) {
                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  